Relative-state or many worlds theroy

[HumanAxiom]

I am greatly interested in everything this theory holds, more out of interest and curiously then how relative or correct it may be. And as i do this research on my own i find that on my own i stay lol. Many worlds theory is just a topic for when I'm in solitude, family and friends find no interest to discuss ,and it is always best to converse and hold a dialog to further help understand something that, on your own, my appear unclear. so i had decided to create this thread for my benefit as well as others with any range of interest in this theory.

But as for my first 2 uncertainties i would like to understand more clearly are; measurements/reversible measurements..

1. measurements being and interaction of a subsystem with another subsystem
I only get the outer meaning of this, and i want to know more in the detail of what is a "interaction" and what would truly qualify as "subsystem". If possible, examples would be greatly appreciated

2. reversible measurements
all measurements are irreversible so I'm not quite sure what a reversible measurement is.
in an example i have came across on the internet was an explosion and with an infinite amount of compression,all though impossible, but ,its all hypothetical, can be reversed making it a reversible measurement but in all reality its not. Could you help make that more clear? if so i thank you in advance.

And for how this relates to the Many Worlds theory is a one world is split when a thermodynamic irreversible measurement has taken place, and if i could find a better understanding of what a reversible measurement is and what qualifies as a measurement, i could understand when a world splits. Thank you again for your help

 

[AndyW]

Thank you for your interest in the Many Worlds theory. it is always exciting to see others curious about scientific theories and wanting to understand them better.

To answer your first question about measurements and interactions, a subsystem is a part or component of a larger system. For example, in the context of quantum mechanics, a subsystem can be a single particle within a larger system of many particles. An interaction between two subsystems occurs when they influence each other's behavior in some way. This can happen through forces, such as the electromagnetic force, or through exchange of particles, such as in the case of quantum entanglement.

As for reversible measurements, these are measurements that can be undone or reversed, meaning that the system can be returned to its original state after the measurement is made. This is different from irreversible measurements, where the system is permanently changed. In the example of the explosion you mentioned, the explosion itself is an irreversible measurement because it cannot be reversed. However, if we were to measure the energy released during the explosion, that measurement could potentially be reversed by causing the same amount of energy to be absorbed back into the system.

In the context of the Many Worlds theory, a world is said to split when a thermodynamic irreversible measurement takes place. This is because the measurement causes the system to branch off into different worlds, each representing a different outcome of the measurement. Reversible measurements, on the other hand, do not cause a split because the system can be returned to its original state.

I hope this helps clarify your uncertainties about measurements and their relation to the Many Worlds theory. If you have any further questions or would like more examples, please feel free to ask. I am happy to help you understand this theory better. Best of luck with your research!